81692568719 has 2 divisors, whose sum is σ = 81692568720. Its totient is φ = 81692568718.

The previous prime is 81692568709. The next prime is 81692568733. The reversal of 81692568719 is 91786529618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81692568719 - 2¹⁶ = 81692503183 is a prime.

It is a super-2 number, since 2×81692568719² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81692568709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40846284359 + 40846284360.

It is an arithmetic number, because the mean of its divisors is an integer number (40846284360).

Almost surely, 2^81692568719 is an apocalyptic number.

81692568719 is a deficient number, since it is larger than the sum of its proper divisors (1).

81692568719 is an equidigital number, since it uses as much as digits as its factorization.

81692568719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 62.

The spelling of 81692568719 in words is "eighty-one billion, six hundred ninety-two million, five hundred sixty-eight thousand, seven hundred nineteen".